Sample tube



FIG. 1 is a perspective view of a sample tube showing our new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Portion of the sample tube shown in broken lines in FIGS. 6 and 7 formsno part of the claimed design.

CLAIM The ornamental design for a sample tube, as shown and described.